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        <li><a href="data_visualize/histgram.html">histgram</a></li>
        <li><a href="data_visualize/polar.html"></a>polor</li>
        <li><a href="data_visualize/sun_figure.html">sun figure</a></li>
        <li><a href="data_visualize/radar_chart.html">radar chart</a></li>
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    <p>realize that you </p>
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